Why would the cops need his laptop? I don’t know the layout of his apartment, but the only reason to search the bathroom was she shot him while he was in there. Same for all the other rooms
What if the victims laptop revealed an intimate relationship with the victim? What if the laptop showed the shooter had borrowed $10,000 from the victim and had never paid it off?
They search the victims residences in crimes like homicides so they can determine if there was any personal connection or relationship with the killer etc.